Small Scratch - "Ghost Scratch" Shader - What and Where use?

[Paulo Sampaio]

Hi everyone.

... So yesterday i was wondering about some micro details of some kinds of materials in real world that i dont know how to reproduce it in CG.

I observed there is some kinds of details, that I dont know what kind of map should i use to do it, and even if i known it, I´m not sure where to put that map ... i´m reffering to real small scratches... and some kind of thing that just appear when light hits it...

I google for some examples...



http://www.cuetopia.net/pics/8ball003a.jpg

take a look to this circle centric specular with this small "lines"... how to reproduce it? it is bump map? anisotropic map? glossiness map? reflect map? a combination of all of theM?

Transparent Material
In this case, transparent material... there are two kinds of scratches.

regular scratches= depth scratch, clearly is affected by some bump map, and get a white color...
small scratches= just appear when light hits... and when transparent is some white color visible...



and the last one: What should i do to get this effect?

finger prints, and some "hand manipulation marks".



yeah... yeah i know its really confuse...

Can someone give some cg example, or explanation?

Thanks

Sorry Bad english